Patent GB-963142-A (GB)
Title: Improvements in or relating to shoe-making machinery
IPC: A43D117/00
Filed: 1959-09-24
Abstract: 963,142. Heel attaching machines. BRITISH UNITED SHOE MACHINERY CO. Ltd. (United Shoe Machinery Corporation). Sept. 22, 1960 [Sept. 24, 1959], No. 32459/59. Heading A3B. Shoe making machinery comprises a track, a plurality of pallets adapted for travelling along the track through an operating station and each arranged to support a shoe in a loaded position for presentation to a shoe making machine at the operating station. A driving means is arranged to move the pallets along the track and means is also provided at the operating station selectively responsive to those pallets only passing through the station which have shoes in loaded positions on them for arresting such selected pallets and causing the shoes carried thereby to be operated upon. The shoe making machine comprises a heel attaching machine which includes a main frame 84 within which a carriage or slide 38 is mounted for lateral movement, having secured to it a heel gauge 40 to receive a heel 28. A nailing die 66, mounted below the slide 38, has passages 64 to which nails or fasteners are fed, after the slide 38 has been moved laterally away from the top face of the said nailing die 66, by a nail loader which includes a loader block 68 and nail passages 70 to which nails are delivered through upper and lower tubes 76, 78 from a nail distributer 80 while the nail loader is in its inoperative position, the lower tubes 78 being part of a selected tube holder 74 which may be exchanged for a tube holder possessing a different pattern of lower tubes. The nail loader is activated by the tripping of a one revolution clutch 158, the tripping being effected by a pallet 48 moving away from the transfer station 46. The loader swings over the nailing die 66 on an arm 152 pivoted about a post 159, a shutter 190 being opened by the mechanism 188 which deposits the nails into the passages 64 of the nailing die 66. The nail loader then swings back into its inoperative position. Drivers 60 attached to a driving head 56 held in a groove 102 of the machine are constructed to move vertically in the passages 64 of the nailing die 66 by fluid pressure means, the movement driving nails in the aforesaid passages into the heel and heel seat of the shoe, the nails being clenched by a metal plate 51 mounted on the last 50. A jack 44 is mounted for horizontal and vertical movement, the former movement taking place in a guideway 194 of a guide beam 196 and effected by pressurized fluid working on a piston 212 in a cylinder 210, and the latter movement being effected by the movement of the plunger 200 attached at its lower end to the guide beam 196 and pivoted at its upper end to a beam 494 which is in turn pivoted about its mid-point 494 in the frame 84. Lasts 50 bearing partially built shoes 36 are mounted and positioned by interlocking means on pallet 48 which are moved along a conveyer 45 by belt means comprising an impeller 81, the lugs 306 of which engage with a driving finger 202 mounted on bails 292 which are pivotally mounted on pallets 48. The pallets 48 carry four wheels or rollers 246 which run in guideways 244, 244a of guide rails 242, 242a, a gap being left in guideway 242 at the transfer station 46 which is filled, when the jack 44 is in the said station, by a portion of guide rail 254 attached to the jack 44 and which guides the pallets 48 on to the said jack 44. Before a pallet 48 is allowed to pass into the transfer station 46, the pallet 48 moving in the direction 256 as indicated in Fig. 6, from the hold-back station 82, a pallet must pass away from the transfer station 46. The hold-back mechanism comprises a lever 346, the lower face of which engages the deflecting plate 317 of the bail 292 which engagement deflects the driving finger 302 away from a lug 306 of the impeller 81. A cylindrical abutment 269 mounted on the pallet 48 engages a lever 400 depressing the plunger of the microswitch M1 which together with the manual depression of switches 476, 476a energizes the solenoid S1, the lever 346 being drawn away from engagement with the pallet 48 through the link 360. On leaving the holdback station 82, the cylindrical abutment 269 engages the lever 364 closing the microswitch M3 thereby de-energizing solenoid S1 so that the hold-back lever 346 moves into its active position against a stop 353 by the action of the spring 354. In the transfer station 46 a dovetail groove 240 of the pallet 48 engages with a dovetail section 236 of the jack 44, a sensing rod 334, which is raised when work is loaded on the pallet 48, effecting the deflection of the driving finger 302 away from a lug 306 of the impeller 81 by a lever 436 engaging the bail 292 of the pallet 48, and allowing detent 222 to clamp against a face of the dovetail groove 240, the positioning of the pallet 48 being effected by a centralizing plate 426. The action is tripped by the sensing rod 324 engaging between the forward wheels 246 of the pallet 48. If an empty pallet 48 moves into the transfer station 46 no tripping takes place as the sensing rod 324 remains retracted and thus the empty pallet 48 passes, without halting, through the transfer station 46. With the jack 44 and a loaded pallet 48 in the transfer station 46 the machine is powered but idle, that is the pistons 112, 500 working in the cylinders 116, 504 respectively are in their retracted positions as shown in Fig. 12, pressurized fluid, high pressure oil, from the pump 512 passes through a relief valve 530, 528, a four way valve 524, and 538 to fill the chamber 508 of cylinder 504 and also chamber 540 of cylinder 116 through line 542 and throttle valve 544. With the loaded jack 44 in the transfer station 46 solenoids 3 and 4 are energized and de-energized respectively, moving the spool 392 in the valve 394 to the left in Fig. 12 allowing fluid to pass through 482 to the face 484 of the piston 212 in the cylinder 210 moving the loaded jack 44 rectilinearly along the guideway 194 to a position above the heel attaching station 52. The back edge of the partially built shoe 36 engages a back plate 452 which in turn, by its lateral movement against springs, effects the opening of one circuit and the closing of another in microswitch M6, energizing solenoid S5. The energizing of solenoid S5 and the consequent movement of the spool 536 in the valve 524 allows fluid at a pressure of approximately 1,000 p.s.i. to pass via a sequence valve 570 into a chamber 562 of the cylinder 504. This pressure raises the piston 500 which in turn raises an end of the beam 494 through a connecting rod 498 pivotally attached at its lower and upper ends to the piston 500 and beam 494 respectively which by the lever action of the-beam 494 lowers the plunger 200 thus forcing the heel seat of the partially built shoe 36 on to the heel 28 in the heel gauge 40. As piston 500 rises, chamber 510 is filled with fluid from the reservoir 586 through a one way valve 593, the sequence valve 570 then allowing fluid at a pressure of approximately 1,000 p.s.i. to pass through throttle valve 584 and 572 to chamber 510 and simultaneously 572a to chamber 574 of the cylinder 116 the nails being driven into the heel 28 and heel seat against a downward thrust of twice times the upward driving thrust. The nails are clenched against the plate 51 of the last 50. An overflow 601 is provided in the cylinder 116 to prevent an excess elevation of the piston 112. During the elevations of piston 112, 500 fluid previously filling chambers 540, 508 drains away to a sump to a valve 524. On the completion of the driving operation the striker 614 triggers off the piston retracting mechanism by the depression of the plunger 616 of the microswitch M7, solenoid S5 being de-energized, pressurized fluid filling chambers 540, 508 of cylinders 112, 500 respectively through valve 524 while chambers 510, 562 of cylinder 500 and 610 of cylinder 112 are emptied through their connection to a sump also through valve 524. The raised, loaded jack 44 subsequently moves back to the transfer station 46 by the action of pressurized fluid on the face 220 of piston 212 which passes through line 486 from the valve 394, the action being effected by the de-energizing and energizing of solenoids 3 and 4 respectively and the movement away from the transfer station 46 then triggers the resetting of the machine for a further heel attaching operation by the engagement of the cylindrical abutment 295 with lever 400. The functioning of the electrical circuit in conjunction with microswitches M1 &c. and switches 476, 476a is described in detail in the Specification. Specifications 14,719/11, 803,330, 863,464, 863,465, 885,859, U.S.A. Specifications 1,381,240 and 2,319,797 are referred to.